ceph/src/boost/libs/type_traits/doc/is_nothrow_move_constructible.qbk

   1 [/
   2   Copyright 2007 John Maddock.
   3   Copyright 2013 Antony Polukhin.
   4   Distributed under the Boost Software License, Version 1.0.
   5   (See accompanying file LICENSE_1_0.txt or copy at
   6   http://www.boost.org/LICENSE_1_0.txt).
   7 ]
   8
   9 [section:is_nothrow_move_constructible is_nothrow_move_constructible]
  10
  11    template <class T>
  12    struct is_nothrow_move_constructible : public __tof {};
  13
  14 __inherit If T is a (possibly cv-qualified) type with a non-throwing move-constructor
  15 or a type without move-constructor but with non-throwing copy-constructor,
  16 then inherits from __true_type, otherwise inherits from __false_type.  Type `T`
  17 must be a complete type.
  18
  19 In other words, inherits from __true_type only if expression `T(std::move(variable1))`
  20 won't throw (`variable1` is a variable of type `T`).
  21
  22 __compat Without some (C++11 noexcept shall work correctly) help from the compiler,
  23 `is_nothrow_move_constructible` will never report that a class or struct has a
  24 non-throwing copy-constructor; this is always safe, if possibly sub-optimal.
  25 Currently (February 2013) MSVC-12.0, Clang and GCC 4.7 have the necessary compiler support to ensure that this
  26 trait "just works".
  27
  28 __header ` #include <boost/type_traits/is_nothrow_move_constructible.hpp>` or ` #include <boost/type_traits.hpp>`
  29
  30 [endsect]
  31